Re: [graphviz-interest] Fixed Node Positions in cgraph

Hi Emden,

Thanks for your reply. Looking through types.h I can only see an
ED_spl macro which seems to do the same thing as the one you're
referring to.

The code I'm currently working on accesses spline data through
edge->u.spl, which seems to coincide with the version of the macro
where WITH_CGRAPH is not defined and indeed the macro expands to the
same expression.

The correct spline information is there when I render wit dot. I have
checked rendering and then getting the position information with
agget, but that still results in straight lines.

Stefan

On 19 August 2013 19:31, Emden R. Gansner <[email protected]> wrote:
> On 8/19/13 1:46 PM, Ștefan Săftescu wrote:
>>
>> Using the `dot` command line tool, you can add the `-Knop` layout
>> option, but if I try `gvLayout(context, graph, "nop"), or call
>> `gvParseArgs` for `dot -Knop` arguments, the resulting graph has no
>> edge routing, even though I have `agset(graph, (char*)"splines",
>> (char*)"true")` in my code.
>>
>> Is there any way I can achieve such edge routing for fixed node
>> positions in cgraph?
>
> Calling gvLayout(context, graph, "nop") does what you want, but the results
> are stored in the library data structures.
> You can read this information using ED_splines(ep), where ep is an
> Agedge_t*, or you can "render" the information
> into the string-valued attributes by calling gvRender (context, G, "dot",
> NULL). You can then read the edge information from
> agget(ep, "pos").
>
> If you are already doing this and it's not working, let us know. Thanks.
>
>     Emden
>
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